Malicious PDF — malware analysis report

Static analysis result for SHA-256 fad55a296c3c993e…

MALICIOUS

PDF

87.3 KB Created: 2021-06-27 15:05:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5a45892dd271bd1d3847725750a78d9d SHA-1: ba9b06c245e4967489f8461b19df6acf3d4edb6b SHA-256: fad55a296c3c993e341a11a46ac1efd051336da55cf0c5d4fa87fc56bc58e3c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting. The primary purpose seems to be redirecting users through these links, potentially to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://pantryscan.com/123cars/imagefck/file/3127720477.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebf63ad8a2---wopup.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16089619566afa---mivezabima.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160bd224c9b943---lexesipu.pdf
    • http://rspon.pl/images/wyswig_images/file/jogel.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/1df187708b3b45d647787a0e90232385/89895583210.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160abf7e2ec013---32023520385.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ecb9993c1---37540853533.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078b66ecb770---74776045000.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6bda4b2bd---noguxa.pdf
    • http://kruengrangthai.com/files/files/zomewuvagisizamoti.pdf
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/98536557647.pdf
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/37e82d04ef7021f251a1d79d2b1e1d3b/sikenirosuvolasesozebefa.pdf
    • https://siroyensao.com/upload/files/75371040911.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160776092517e5---kilazamisuxusovifasaju.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca6660465e---34377731095.pdf
    • http://www.anieliasfx.com/uploads/textareas/file/lovulene.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/9b9b2ff888a0b84c08c87d5d5b99f32b/57719385609.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fda4512889---81862932880.pdf
    • http://hakkabrothers.com/userfiles/file///morevurevitoxigetazufe.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/d4433c2acb1cb61459d663999d95cf23/21656571039.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/76ccfb9e7c32bfdd0cf86e9d1fcbb17a/90016514981.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/vixewamemavuvo.pdf
    • https://invest.pl/userfiles/file/55799543868.pdf
    • http://vzwsportenmuziek.com/content_docs/52382202424.pdf
    • http://wildpflanzen-planung.de/file/bumegulutom.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=daniel+day+lewis+overrated
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3b9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B9 16792 bytes
font_01_sfnt_off00010bcb.bin
4399b8c94d514c80f326e27f2ff7d8cfbb64ed1083a4f952441abc0ec06d90d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCB 16824 bytes
font_02_sfnt_off000137a0.bin
fea13a37298a850f3fccc090329d5819e87a5e1e8117c4b39a6f1e80f6364bef
pdf-font-stream PDF embedded font (sfnt) at offset 0x137A0 10508 bytes